The shift to dangerousness-oriented civil commitment criteria has led to speculation that mentally ill persons who do not meet those criteria are being hospitalized under criminal commitment statutes. Using data on patients' psychiatric symptoms at admission to a state hospital in Massachusetts, the authors retrospectively assessed whether patients charged with minor criminal offenses who were committed for evaluation of competence to stand trial would have met civil commitment criteria. The data suggest that most mentally ill patients who were criminally committed could have been civilly committed. However, a relatively greater proportion of persons with substance abuse, mental retardation, or other conditions who did not meet civil commitment criteria for mental illness were committed for pretrial evaluation.